Possible to get P155E w/failed idle actuator? - BMW M5 Forum and M6 Forums
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post #1 of 4 Old 24th February 2017, 02:20 AM Thread Starter
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Possible to get P155E w/failed idle actuator?

So, as the title suggests.

Changed all 10 plugs the other day, started up very nice and idled smoother than before...not surprising, if I had to guess the plugs hadn't been changed since the first Obama term. Went to go for a drive, going up a hill toed into the throttle a bit and immediately got the full complement of standard errors you get with failed idle or throttle actuators. RPM limited all the way down to 2500 rpm, which is borderline dangerous. Quick and dirty scan with Automatic gave me P155E, limped it over to my friend's house in town and used Carly to grab a real scan - one of the codes was 2B0E, failed bank 2 idle actuator.

Seems everyone with 155E has had failed throttle actuators, but since its a failed value by the monitoring system only, I imagine failed idle actuators could cause this too? Hope that's the case as I've already purchased 2 to replace both in case the other is also on its way.

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post #2 of 4 Old 25th February 2017, 12:52 AM
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Yes. Your TA went out: P155E: Throttle Actuator Monitoring Actual Value / Desired Value Correlation (Bank 2). Very likely. It could also be your throttle position sensor or a stiff linkage system, but given what we know it is unlikely. Run a test in ISTA/D to see if you can reproduce issue without driving it. Lube it up.
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post #3 of 4 Old 25th February 2017, 02:33 AM Thread Starter
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Thanks, appreciate the input. That's next on the list. Have to get my USB-OBD cable to play nice with the computer the software is installed on...always fun.

Definitely will lube up and inspect the linkage while I'm in there too, as far as I know the car hasn't ever really had any work done to that part of the engine, so I imagine things could use a bit of a checkup anyway.


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post #4 of 4 Old 1st March 2017, 05:54 PM Thread Starter
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Quick update - did both idle actuators yesterday - I think that was the most time I've ever spent working on any car for one job in one go.

Managed to break a couple pieces off of some of the plastic on the electrical connectors but those are about the only complications.

Imagine my surprise when after I took the plenums off I found...a shop towel stuck in the throttle body. When changing the spark plugs, I covered up the plenum openings with shop towels, the driver's side towel must have fallen inside far enough that I didn't see it and forgot it was there. Certainly explains...everything. To a point. I am curious as to why it produced an idle actuator failure - I'm guessing the DME saw the incorrect idle obviously happening due to something being stuck in the throttle body as a result of a failed actuator? Regardless I replaced both anyway since I was in there and I sure as hell wasn't going to leave the old ones. Placebo effect tells me it does feel better at low RPMs but I also didn't get a chance to actually feel the difference from the new plugs and I also pulled the charcoal filters when reassembling after replacing the IAs yesterday. So I could be feeling that. May have some used but fine idle actuators if anyone wants to buy them...

Never in my life have I made a mistake like that while working on something, a little unnerving and incredibly lucky something worse didn't happen. Unfortunately I was so shocked I forgot to take a picture.

Also found what seemed like a mouse nest in the empty space between the front-most TA and the bank 2 IA, given that the car spent winters parked with previous owners this doesn't surprise me. Pretty disgusting pulling that out...


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